Injection Preform Mold
Company Profile
On the coast of China East, Taizhou Huangyan Maiwei Machinery Co.,Ltd is located in Huangyan,which is famous of Mould Kingdom and blow moulding machine hometown. Taizhou Huangyan Maiwei Machinery Co.,Ltd with advanced technology and ideas adopted at home and aborad, specializes in design, manufacturing and sales of three categories, more than 20 models of PET,PP and PE fully, semi and manual automatic blow moulding machines for plastic containers for mineral water, beverage ,cosmetic, milk and oil from 5ml to 40L. Excellent quality, stability and nice performance-cost help us win customer from China, Southeast Asia, Middle East, Africa, Europe and America.
Why Choose Us
Our factory
On the coast of China East, Taizhou Huangyan Maiwei Machinery Co.,Ltd is located in Huangyan,which is famous of Mould Kingdom and blow moulding machine hometown.
Our product
Taizhou Huangyan Maiwei Machinery Co.,Ltd with advanced technology and ideas adopted at home and aborad, specializes in design, manufacturing and sales of three categories, more than 20 models of PET,PP and PE fully, semi and manual automatic blow moulding machines for plastic containers for mineral water, beverage ,cosmetic, milk and oil from 5ml to 40L.
Production market
Excellent quality, stability and nice performance-cost help us win customer from China, Southeast Asia, Middle East, Africa, Europe and America.
Our service
We try and respond to all concerns within 24 hours and our teams are always at your disposal in case of any emergencies.
We have many patent in hot runner system of preform die .With our strong technology innovation and excellent service, Maiwe can make preform die from 2 cavity to 72 cavity preform die for all brand injection molding machine ,such as KraussMaffei, Arburg, Ferromatic, Haitian ,Borch, Yuzumi, Toshiba and so on.
As our research and development team are in this line more than 15 years experience ,We have many patent of hot runner system in PET PRFORM MOLD.
Our research and development team was in PET industry more than 16 years experience,specializing in self -developing manufacturing injection preform mold.
Our research and development team are in this line more than 15 years experiences. We have many patent of hot runner system in PET mould.
With our strong technology innovation and excellent service, we has become one of the professional Hot runner preform mold manufacturer and service provider in Zhejiang ,China.
Maiwei Machinery have many patent in hot runner system of valve gate preform mold. We can make valve gate preform mold from 2 cavity to 72 cavity valve gate preform mold for all brand injection molding machine ,such as KraussMaffei,Arburg,Ferromatic,Haitian ,Borch,Yuzumi,Toshiba and so on.
We research and development team was in PET industry more than 16 years experience, specializing in self -developing manufacturing wide mouth preform mold.
Our research and development team was in PET industry more than 16 years experience, specializing in self -developing manufacturing pet molds.
We machinery our Preform Mould by high advance CNC machine ,grinder machine ,drilling machine ,EDM machine and so on. We can make it from 2 cavity to 72 cavity for all brand injection molding machine ,such as KraussMaffei, Arburg, Ferromatic, Haitian , Borch, Yuzumi, Toshiba and so on.
What Is Injection Preform Mold
A injection preform mold, also known as a preform die or preform tooling, is a specialized mold used in the plastics industry to produce preforms, which are intermediate products used in the manufacturing of plastic bottles, containers, and other hollow objects through a process called blow molding. The injection preform mold is typically made of high-quality steel and is designed to shape molten plastic material into a specific form and size that will be further processed in a blow molding machine to create the final product. The injection preform mold is used to create a preform with a precise shape, thickness, and dimensions that are crucial for the quality and functionality of the final plastic product. The injection preform mold consists of two halves that come together to form a cavity where the molten plastic material is injected under high pressure. Once the plastic material cools and solidifies, the mold is opened, and the preform is ejected for further processing.
Advantages of Injection Preform Mold
High efficiency and fast production
The standout benefit of injection preform mold lies in its efficiency and swift production capabilities. The rapid nature of the injection preform mold process is a key driver in reducing production time and enhancing output rate, making it an invaluable asset in meeting market demands swiftly.
Ability to produce complex geometries
Another significant advantage of injection preform mold is its proficiency in creating complex and detailed designs.This capability opens doors to innovation and complexity in design, pushing the boundaries of what can be achieved in part design and geometry.
Excellent repeatability
A critical aspect of injection preform mold is its excellent repeatability. This aspect is particularly important in industries where precision and uniformity are paramount, such as the automotive and medical industries. The ability to reproduce products with minimal variance is a testament to the reliability and precision of injection preform mold.
Wide range of material options
Injection preform mold excels in its versatility, offering a wide array of material choices. From sturdy plastics for automotive components to flexible materials for consumer goods, the breadth of material selection in injection preform mold caters to a vast spectrum of industry requirements. This flexibility not only enhances the design elements but also allows manufacturers to tailor products according to specific material properties.
Design Considerations for Injection Preform Mold
Wall thickness
The wall thickness of the preform must be uniform to ensure consistent quality and minimize defects during the blow molding process.
Gate design
The gate is the entry point for the molten plastic into the mold cavity. Proper gate design is critical for ensuring minimal waste, smooth filling, and easy removal of the preform.
Cooling system
An efficient cooling system is essential to regulate the cooling process and maintain a consistent cycle time.
Ejection mechanism
The ejection system must be designed to gently remove the preform from the mold without causing any damage.
Notes About Pet Injection Preform Mold Process
PET material is dried
PET is a hygroscopic material, if the moisture content is too high, will produce at a high temperature hydrolysis process, the PET molecular chains and thermal decomposition of acetaldehyde, reduce physical and mechanical properties, the crystallization rate of speed, when the Preform Injection, will Preform partially crystalline bleaching, affecting the quality of the product. Before preform injection molding, PET grain must be dried to a moisture content of 0.05% or less, so that it can create a good non-crystalline transparent preform. PET grain dryer use high temperature air is dehumidified, circulation in the hopper. Dry air, the dew point temperature must be between -29 ℃ and -40 ℃. Temperature of the dryer was set at between 177 ℃ and 182 ℃, dried for about four hours.
Injection molding
First, injection molding processing system to a preform , which is fired into the mold cavity to melt, and then rapidly cooling, the preform temperature below the crystallization temperature range, made of transparent preform; a second step of the preform is heated, it is higher than the glass transition temperature, and then extended, blow molding and cooling. One-piece and two-stage is divided into two kinds. One-piece is shot and blow in the same machine is completed, injection molded preform is cooled to below the crystallization temperature range, but remains in a state of thermo-elastic, and finally blowing into bottles. It is completed by the two-stage injection molding machines and blow molding machine two machines. First by the injection molding machine into a preform after the preform is cooled to freezing temperatures Tuomo removed, cooled to room temperature, to be blowing, the blow molding machine and then sent to the preform is heated to a temperature of blowing and blowing, cooling molding.
PET preform injection molding process conditions
PET preforms are available in addition to the extrusion process, the majority are produced by injection molding preforms. Throughout the preform process equipment, in addition to injection molding machines, further comprising: a hot runner mold, polyester pellets dehumidifying dryer, mold cooling ice machines, bottle embryo out robot arm, conveyor and preform injection environment controlled air dehumidifier, and each is to tie all equipment injection molding machine actuation, the injection molding machine injection preform molding process plays the most important role. Each parameter stake emitted quality of the product, therefore, control parameters are important to achieve good process parameters, the performance of injection molding machine and shall be designed to meet process requirements.
Screw design
PET screw injection molding machine is designed to preform injection molding process is very important. Usually when used in PET screw injection poor quality, easy to cause problems, therefore, PET injection machine must have its own dedicated screw. Because PET is heat sensitive material, easy to make high temperature molecular chains, so that molecular weight reduction, produce acetaldehyde, reduce the quality of preform; and in the tube, mainly by rotation of the screw compressor, the ester grain shear heat melted, if the screw compression shear heat generated is too large, the thermal cracking of PET may occur, therefore, shall PET injection screw low shear design, and can melt crystallized PET polyester pellets as the target. The compression ratio is too high or too short can cause compression of the length of the large shear; and low shear heat generated by the compression ratio of the screw is insufficient, may not be completely melted polyester pellets so preform crystallization of the fog, and can not completely exclude the air feed tube, easy to make preform bubbles.
How Does A Injection Preform Mold Work In The Manufacturing Process
Preform injection
The process begins with injecting molten plastic material, usually pet (polyethylene terephthalate), into the injection preform mold. The plastic material is injected under high pressure and at a controlled temperature.
Mold cavity formation
The injection preform mold consists of multiple cavities, each shaped like a half-formed bottle. The molten plastic material fills these cavities, taking the shape of the desired bottle's neck and body.
Cooling and solidification
After the molten plastic fills the mold cavities, the cooling process begins. The mold is designed to facilitate the rapid cooling of the plastic material, allowing it to solidify and take the shape of the bottle preform.
Ejection
Once the plastic material has solidified, the injection preform mold opens, and the formed preforms are ejected. The ejection can be done manually or with the assistance of automated mechanisms.
Further processing
The ejected preforms undergo additional processing steps before becoming fully-formed bottles. These steps typically include reheating the preforms to a specific temperature to make them malleable, stretching them using a stretch blow molding process, and then finally inflating them to the desired shape and size using compressed air.
Quality control
Throughout the manufacturing process, quality control measures are implemented to ensure the preforms meet the required standards. This can include visual inspections, dimensional checks, weight measurements, and other quality assurance tests.
Key Technologies for PET Injection Preform Mold
Processing of pet material before injection molding
Because pet macromolecules contain fat bases and have certain hydrophilicity, pellets are more sensitive to water at high temperatures. When the moisture content exceeds the limit, the molecular weight of pet decreases during processing, and the product becomes colored and brittle. Because of this, the materials must be dried before processing. The drying temperature is 150°c for more than 4 hours, generally 170°c for 3-4 hours. The air shot method can be used to check whether the material is completely dry. The proportion of recycled materials should generally not exceed 20%, and the recycled materials must be thoroughly dried.
Pet injection preform mold and gate design
Pet preforms are generally molded by hot runner molds. It is better to have a heat shield between the pet injection preform mold and the pet injection molding machine platens. The thickness of which is about 12mm, and the heat shield must be able to withstand high pressure. The exhaust must be sufficient to avoid local overheating or chipping, but the depth of the exhaust port should generally not exceed 0.03mm, otherwise it is easy to produce flash.
Pet preform injection molding temperature
Here we talk about the pet injection molding temperature is about the melting temperature mostly. It is set with injection molding machines nozzle temperature or by the main runner temperature of the pet preform mould. The temperature ranges is normally from 270-295℃, and the enhanced gf-pet can be set at 290-315℃.
Injection speed for pet preform injection molding
Normally, we prefer to have a high injection speed to prevent premature solidification during pet preforms injection process. But it will cause too big molecular stress and the preform will be whitened and getting fragile if the injection speed is too fast. Just make sure the injection time within 4 seconds should be good.
Pet preform injection molding backpressure
The lower the better to avoid wear. Generally not more than 100bar. We normally not use backpressure during the pet preform injection molding process.
Residence time or stop time of pet preform making production line
Just try your best to avoid long residence time to prevent the pet material molecular weight dropped down. Make sure the heating temperatures of pet raw material is below 300°c all the time. If the downtime is less than 15 minutes, just empty the melted materials in the barrel will be okay; but if it more than 15 minutes, please put some viscosity pe in the hopper and shot out all the pet material out and let the pe in the barrel, and reduce the barrel`s heating temperature to pe temperature until it is turned on again.
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